[chromium] Update webaudio/realtimeanalyser-fft-sizing.html expectation on Win

Unreviewed gardening.

* platform/chromium-win-xp/webaudio/realtimeanalyser-fft-sizing-expected.txt: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140378 268f45cc-cd09-0410-ab3c-d52691b4dbfc